Abstract
The point cloud data generated from UAV photogrammetry are put to various uses such as management of work amount completed and as-built conditions in earthwork, as well as prompt grasp of the situation during disasters. Their accuracy affects measuring conditions of UAV and analytical parameters of the photogrammetry software; therefore, it is necessary to specify it appropriately depending on the situation of the sites. Existing researches have proposed methods for ensuring the required accuracy by analyzing measuring conditions. However, even when the measuring conditions are appropriate, it has a problem that the accuracy as well as costs in time and man power may vary depending on the difference in analytical parameters. Another problem is that when it is impossible to set up ground control points in the circumstances during disasters, suitable analytical parameters cannot be set up. This research proves the relationship between time and accuracy depending on the difference in analytical parameters, proposes an analytical method for UAV photogrammetry that is assumed to be utilized during disasters and confirm to apply to the real disaster site.
